SSLC SCIENCE QUESTION PAPER APRIL 2016

Four alternatives are given for each of the following questions / incomplete statements. Only one of them is correct or most appropriate. Choose the correct alternative and write the complete answer along with its letter in the space provided against each question. 10  1 = 10
1. In Fleming’s right hand rule middle finger indicates the direction of
(A) magnetic field (B) induced electric current
(C) mechanical energy (D) motion of the conductor.
2. Identify one of the uses of solar heater in the following.
(A) Conversion of solar energy into electrical energy
(B) Providing energy for artificial satellites
(C) Desalination of marine water
(D) Using in automatic streetlights.
3. Significant reduction in the platelet count of human blood is the main symptom of this disease.
(A) Chikungunya (B) Dengue
(C) Bird flu (D) Gonorrhea.
4. Si + C → SiC. This chemical reaction is an example for
(A) exothermic reaction (B) endothermic reaction
(C) dissociation reaction (D) displacement reaction.
5. No image is formed on the blind spot of human eye because,
(A) cones are absent (B) rods are absent
(C) rods and cones are absent (D) optic nerve is absent.

6. A domestic electrical appliance requires alternating current of 15 V. If 220 V of alternating current is supplied to the house, then the device thathelps in the functioning of that electrical appliance is
(A) induction coil (B) step-up transformer
(C) AC dynamo (D) step-down transformer.
7. While doing the experiment of copper voltameter, in which of the following cases, more amount of copper gets deposited at cathode ?
(A) 2 amperes of electric current is passed for 30 minutes
(B) 4 amperes of electric current is passed for 20 minutes
(C) 0·5 amperes of electric current is passed for 80 minutes
(D) 1·5 amperes of electric current is passed for 30 minutes.
8. Identify the correct complementary base pairing among the following.
(A) Adenine — Thymine and Guanine — Cytosine
(B) Adenine — Guanine and Thymine — Cytosine
(C) Adenine — Cytosine and Thymine — Guanine
(D) Guanine — Adenine and Cytosine — Adenine.
9. Find out the most efficient engine in the following.
(A) an engine converts 80 KJ of heat energy into 20 KJ of work
(B) an engine converts 50 KJ of heat energy into 15 KJ of work
(C) an engine converts 30 KJ of heat energy into 6 KJ of work
(D) an engine converts 60 KJ of heat energy into 24 KJ of work.
10. Haemoglobin levels in the blood samples of two persons A and B are found to be 9 gm/dL and 13 gm/dL respectively. Which statement is true with
respect to the amount of oxygen supply in their body ?
(A) More in person B than in person A
(B) More in person A than in person B
(C) Equal in person A and person B
(D) No correlation between oxygen supply and the level of haemoglobin.

11. The structural formulae of hydrocarbons are given in Column-A and their uses are given in Column-B. Match them and write the answers along with its letters in the space provided : 4  1 = 4
Column - A Column - B
(A)
(i) preparation of moth balls
(B)
(ii) solvent for lacquers
(iii) preparation of soap
(iv) dry cleaning
(C)
(v) used as fuel
(vi) preparation of esters
(D)
(vii) preparation of aspirin.
Answer the following questions : 7  1 = 7
12. Write any two advantages of bio-energy.
13. What is red shift ?
14. Name the two important non-metallic oxides which cause acid rain.
15. Mention the properties of silica due to which it is used as sand bath in
laboratory.

16. State the modern periodic law.
17. Draw the circuit symbol of n-p-n transistor.
18. Sclerenchyma fibres are used in coir industries to make gunny bags and
ropes. Give scientific reason.
Answer the following questions : 26 × 2 = 52
19. Draw the diagram of a DC dynamo and label the following parts.
(a) Split rings (b) Armature coil.
20. What is annealing of glass ? Name the colour obtained when (i) Ferric
compounds, (ii) Cobalt compounds are added to the mixture of molten
glass.
OR
What is pulping ? How is an uncoated paper converted into coated paper ?
21. Draw the diagram of the apparatus used in electroplating and label the
following parts.
(i) Electrolyte (ii) Anode.
22. Lymph plays an important role in protecting immune system of the body.
Justify this statement.
OR
(a) How is dermal tissue adapted to prevent excessive transpiration in
plants ?
(b) Why do leaves of lotus plant float on water ?
23. Draw the diagram of blast furnace used in the extraction of iron.
24. Differentiate between Caucasoid man and Mongoloid man based on their
physical features.
25. What is forward biasing and reverse biasing of a diode ?
OR
What are extrinsic semiconductors ? Name the two types of extrinsic
semiconductors.

26. Sodium ( Na ), Magnesium ( Mg ), Aluminium ( Al ) and Silicon ( Si ) are
arranged in the decreasing order of their atomic size. Which element has
the highest ionisation energy among them ? Justify your answer
scientifically.
27. Draw the diagram showing the structure of HIV.
28. The densities of 4 gases at standard temperature and pressure are given in
the table :
Gas Methane Ammonia Helium Neon
Density 0·72 g/L 0·77 g/L 0·18 g/L 0·90 g/L
Among these gases, which gas diffuses very fast ? State the law that helps
you to take the decision.
29. Hydroponic and aeroponic methods are gaining significance in space
research organisations. Give two reasons for this.
OR
Urban people should be encouraged to take up the practice of roof-top
gardening. Justify.
30. What are ultrasonic waves ? Write any two uses of ultrasonic waves in the
field of medicine.
OR
What is an echo ? Name the two devices which work on the principle of
echo of ultrasonic waves.
31. Hydroelectric power plants are more ecofriendly than thermal power
plants. Justify this statement.
32. The general formula of a group of organic compounds is C
n
H
2n  1
OH.
Write the molecular formula of first two members of this group. Examine
whether these two compounds are in homologous series, based on their
molecular formula.

33. The graph of a wave motion is given below. Observe the graph and answer
the following questions :
(a) What type of wave is represented in the graph ?
(b) What do PQ and PR indicate with respect to the wave ?
34. A student catches small aquatic creatures swimming in a pond and keeps
them in his aquarium assuming them to be fishes. After a few days he
observes that four limbs are developed in those creatures. Then,
(i) to which class of vertebrates do you include those aquatic creatures ?
(ii) name the process that has caused development of four limbs in them.
35. Write the two differences between petrol engine and diesel engine.
36. Write the structural formula of normal butane and isobutane.
37. Draw the diagram of a dicot plant.
38. Name the three types of galaxies. What is the name of the galaxy to which
our solar system belongs ?
39. Write the ill-effects of noise pollution on human health.
40. State Faraday’s laws of electromagnetic induction.
41. How is diabetes mellitus caused ? Mention the two important symptoms of
this disease.

42. Write the two advantages of hydrogenation of oils.
43. Name the components of phloem tissue.
44. The atomic number of calcium is 20. Find out to which period and block
calcium belongs in the modern periodic table.
Answer the following questions : 5  3 = 15
45. Draw the diagram of a nuclear power plant and label the following parts.
(a) Control rods (b) Radiation shield.
46. Name the steps in the manufacture of common sugar from sugarcane and
explain the first step.
OR
(a) What is fermentation ? Give one example.
(b) Write the balanced chemical equations of the reactions taking place
in the manufacture of ethyl alcohol from sugar.
47. (a) Bryophytes are used in pots. Why ?
(b) Explain alternation of generations in Bryophytes.
48. (a) Explain the expansion stroke of a petrol engine.
(b) There is no spark plug in diesel engine. Why ?
49. What is bio-technology ? List any two advantages and two limitations of
biotechnology.
OR (a) Why did Mendel choose pea plants for his experiments ? Give any four reasons.
(b) State Mendel’s law of independent assortment.

Answer the following questions : 3  4 = 12
50. (a) Which stage is attained by the star after the steady state ? Explain that stage.
(b) State Hubble’s law.
(c) A satellite is to be launched from the surface of the earth. Name the factors on which the escape velocity of the satellite depends.
OR
(a) “Multistage rockets reduce the fuel consumption.” How ? Explain.
(b) Explain how a neutron star is formed.
(c) In which stage of the star, does nuclear fusion reaction begin ?
51. Draw the diagram showing the internal structure of human ear and label the following parts :
(a) Organ of Corti (b) Auditory nerve.
52. (a) 2Mg + O2
→ 2MgO.
In this reaction, explain the experiment that you conduct to decide the product as a basic oxide.
(b) Name the method of concentration of Haematite ore and explain the method.